Anyway, the similarity of the design with that of the CSA navy jack,
which is also frequently used by Russian ultra-rightist groups, must
have been noticed by the leadership of Novorossiya, because a new
state flag was recently adopted, the old one being kept in use as the
war flag.

In the video, old and new flags
of Novorossiya are visible all the time as the table flags, but
the presentation of new state flag and new war flag (old state
flag) begins about @6:50. Since the presentation date was
2014-08-13, it can be considered the adoption date as well, until
more information is available.
Tomislav Todorovic, 8 Sep 2014

I'm attaching a picture of a rally in Ukraine. Please note the "Red St
Andrew's Flag" . I hadn't seen that flag before. There are many
other flags, some already known, others not so. I'm enclosing
also my rendition of the said flag and that of the Airborne Troops
with a yellow parachute.HB, 1 June 2014

The "Red St Andrew's Flag" is of course the Novo Rossiya flag we have been
seeing.Rob Raeside, 1 June 2014

The Russian ethnic republic in Ukraine was named Novorossiya
and was proclaimed c. 1992 but fall some days after. Flag of red
with Ukrainian colors below could be used but is not confirmed
(some reports from Ukraine say that the Russian hoisted also old
Ukrainian SSR flag without hammer and sickle at a larger collection of
flags with the Russian colors in several arrangements) No more
details are known to me.Jaume Ollé, 14 August 1999

"Novorossiya" (something like HOBOPOCCNR) means
"New Russia". Quite inappropriate, considering that
deepest roots of Russian history are found precisely in the
territory of nowadays Ukraine...
Anyway, was this "republic" supposed to be a part of
newly independent Ukraine (like the current status of Crimea), a
genuine independent state, or an escape to grab territory from
Ukraine to Russia? And where was it territorially based, if
anywhere in special? (I guess that in NE Ukraine).
Flag of red with Ukrainian colors below can be used but I doubt
it: The 2R-1B-1Y horizontal would have been preferred by
moderated Ukrainian communists. The old Ukrainian SSR flag
without hammer and sickle at a larger collection of flags with the Russian
colors in several arrangements is more probable, like the flags
used by the Russian population of Crimea --
probably the same people waving the same flags, after all, this
"Novorossiya" would include Crimea, where Ukrainians
are minority.Antonio Martins, 15 August 1999

The name refers to the territory along the Black Sea
coast--now partly in northeastern Ukraine--that was annexed from
Turkey between 1774 and 1792 and actively colonized by ethnic
Russians (and also Germans) in the late 18th-early 19th
century. It does not include the area around Kiev (or Kyyiv, if you're Ukrainian), which
was the heartland of the first Russian state (Kievan Rus).Joseph McMillan, 16 August 1999

It is the area of the current regions of Zaporizha
and Kherson (so I guess you mean
southeastern Ukraine then), by the Sea of Azov.António Martins, 17 August 1999